The approach of Windows 8 on tablets - now less than six months away - will put extra pressure on Google, as its own Android products struggle against Amazon's forked version and the iPad's dominance. By Charles Arthur

Charles Arthur: Having built the Kindle Fire, some are suggesting that Amazon will next move into mobile phones. But that's a tricky business to make work. Another one has far more potential to make money

We can't find a tablet apart from the iPad for which Amazon offers its own as a substitute instead. Asus Transformer, PlayBook, TouchPad, Galaxy Tab... only the iPad gets the replacement suggestion. Wonder why? By Charles Arthur